Beyond the Museum: Tinkering with Paper Circuits

Graph of the voltage drop for varying colors of LEDs. Without a resistor in the circuit, LEDs with similar voltages can be turned on in parallel but LEDs with higher voltages will automatically dim if a lower voltage LED is turned on in parallel.

Graph of the voltage drop for varying colors of LEDs. Without a resistor in the circuit, LEDs with similar voltages can be turned on in parallel but LEDs with higher voltages will automatically dim if a lower voltage LED is turned on in parallel.